Besides the Pope's trip to Turkey and President Bush's quick visit to meet with Iraqi President Nouri al-Maliki, the dominant story of the week has been the poisoning of the former KGB agent in London. That mystery just keeps deepening.
As British security agents continue their investigation, we now know of others who were also contaminated by the exotic murder weapon -- the radioactive isotope polonium-210 -- including Alexander Litvinenko's wife.
We are preparing an hour-long special on this to air Monday at 10 p.m. We'll have reports from London, the United States, Italy and Russia. But the story that most intrigues me right now will come from our "360" MD, Dr. Sanjay Gupta.
Any good murder mystery -- and this is a good one -- spends much time examining suspects and motives. But in this story, perhaps the strange murder weapon itself could prove to be the most fascinating angle. And that's what Sanjay, with his tremendous medical expertise, will examine. Consider some of the questions he'll explore:
1. Why use polonium as murder weapon? Clearly, there are many ways to poison or kill someone, most far less risky and perhaps even more effective, so the mystery is, why use it? Is it 100 percent effective? Does the agonizing nature of the death send a message?
2. Polonium (that concentration, anyway) is extremely rare, so perhaps they figured toxicology and pathology reports would not screen for it, would not find it?
3. How in the world did the docs figure out what it was? What kind of medical and toxicological screening would you need to ferret out the polonium?
4. What is the risk to the assassin? Today's news reports indicate there is a good chance the assassin got it on him or herself. What is the assassin's risk factor?
Our teams are working through the weekend on this. So if you have thoughts or advice on these questions, please "blog" us. We'd love your help.